Abstract

PROANO, Pablo; CAMACHO, Oscar  and  POZO, Marcelo. Non-linear control strategies for current regulation and DC voltage stabilization for a wind turbine operating in a microgrid. Novasinergia [online]. 2020, vol.3, n.1, pp.45-53. ISSN 2631-2654.  https://doi.org/10.37135/ns.01.05.05.

The generation of electrical energy from renewable energies, especially wind, is taking greater participation in the energy market worldwide. Due to the high wind dynamics, there are variations in the system's frequency and voltage, making it challenging to integrate these generators into the electrical system. Several works propose different control strategies implemented in electronic power systems to solve this problem. These systems first rectify the generator's variable voltage, creating a direct current (DC) link and then transforming it into voltage with constant magnitude and frequency. The most common controllers are PID (proportional integral derivative), which have a good performance in linear operation areas. However, there are non-linear proposals with broad advantages over PIDs, especially in systems with fast and non-linear dynamics. In this study, linear PID controllers are implemented. Two non-linear control strategies are proposed, one with a PID structure and the other with sliding mode control (SMC), to regulate the current and voltage supply in wind turbines connected to electronic system power. A non-linear gain was implemented in the proposed controllers, which is calculated based on the system error; their performance was compared with linear PID controllers. The results showed notable improvements in the system's stabilization speed and reduction of oscillations in the face of sudden reference variations and external disturbances. A micro-network linked to an infinite bar was simulated in Simulink to test the controllers' performance.

Keywords : Electric power systems; non-linear control; sliding mode control; wind turbine.

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